marine ecoregions
   (Biogeographic realm) Temperate Northern Pacific
     (Biogeographic province) Cold Temperate Northwest Pacific
       45 (Marine ecoregion) Sea of Okhotsk
       46 (Marine ecoregion) Kamchatka Shelf and Coast
       47 (Marine ecoregion) Oyashio Current
       48 (Marine ecoregion) Northeastern Honshu
       49 (Marine ecoregion) Sea of Japan
       50 (Marine ecoregion) Yellow Sea